Finding the Fourth Proportional to 105,743.30, 145,849.29 and 89,802.50

Step by Step Solution

1. Step 1: Write the proportion equation
   105,743.30 : 145,849.29 = 89,802.50 : x
2. Step 2: Convert to fraction form
   105,743.30/145,849.29 = 89,802.50/x
3. Step 3: Cross multiply
   105,743.30x = 145,849.29 × 89,802.50
4. Step 4: Simplify right side
   105,743.30x = 13,097,630,865.23
5. Step 5: Solve for x
   x = 13,097,630,865.23/105,743.30
6. Step 6: Final answer
   x = 123,862.51